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C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_hdissip.F,v 1.2 2005/03/10 03:45:11 baylor Exp $ |
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C $Name: $ |
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|
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#include "MOM_COMMON_OPTIONS.h" |
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|
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SUBROUTINE MOM_HDISSIP( |
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I bi,bj,k, |
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I tension,strain,hFacZ,viscAt,viscAs, |
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O uDissip,vDissip, |
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I myThid) |
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IMPLICIT NONE |
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C |
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C Calculate horizontal dissipation terms in terms of tension and strain |
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C |
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C Du = d/dx At Tension + d/dy As Strain |
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C Dv = d/dx As Strain - d/dy At Tension |
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|
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C == Global variables == |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "GRID.h" |
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#include "PARAMS.h" |
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|
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C == Routine arguments == |
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INTEGER bi,bj,k |
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_RL tension(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL strain(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS hFacZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL viscAt |
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_RL viscAs |
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_RL uDissip(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vDissip(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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|
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C == Local variables == |
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INTEGER I,J |
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_RL viscA_t(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL viscA_s(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL ASmag, smagfac |
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_RL vg2Min, vg2Max, AlinMax, AlinMin |
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_RL lenA2, lenAz2 |
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|
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IF (deltaTmom.NE.0.) THEN |
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vg2Min=viscAhGridMin/deltaTmom |
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vg2Max=viscAhGridMax/deltaTmom |
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ELSE |
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vg2Min=0. |
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vg2Max=0. |
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ENDIF |
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|
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C - Calculate Smagorinsky Coefficients |
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smagfac=(viscC2smag/pi)**2 |
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DO j=2-Oly,sNy+Oly-1 |
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DO i=2-Olx,sNx+Olx-1 |
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IF (viscC2smag.NE.0.) THEN |
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C Geometric Mean is used as length scale |
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lenA2=(2*rA(i,j,bi,bj)/ |
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& (dxF(I,J,bi,bj)+dyF(I,J,bi,bj)))**2 |
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|
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Asmag=smagfac*lenA2 |
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& *sqrt(tension(i,j)**2 |
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& +0.25*(strain(i+1, j )**2+strain( i ,j+1)**2 |
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& +strain(i-1, j )**2+strain( i ,j-1)**2)) |
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viscA_t(i,j)=min(viscAhMax,max(viscAt,Asmag)) |
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|
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IF (vg2Max.GT.0.) THEN |
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AlinMax=vg2Max*lenA2 |
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viscA_t(i,j)=min(AlinMax,viscA_t(i,j)) |
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ENDIF |
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AlinMin=vg2Min*lenA2 |
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viscA_t(i,j)=max(AlinMin,viscA_t(i,j)) |
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|
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C Geometric Mean is used as length scale |
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lenAz2=(2*rAz(i,j,bi,bj)/ |
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& (dxV(I,J,bi,bj)+dyU(I,J,bi,bj)))**2 |
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Asmag=smagfac*lenAz2 |
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& *sqrt(strain(i,j)**2 |
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& +0.25*(tension( i , j )**2+tension( i ,j+1)**2 |
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& +tension(i+1, j )**2+tension(i+1,j+1)**2)) |
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viscA_s(i,j)=min(viscAhMax,max(viscAs,Asmag)) |
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|
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IF (vg2Max.GT.0.) THEN |
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AlinMax=vg2Max*lenAz2 |
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viscA_s(i,j)=min(AlinMax,viscA_s(i,j)) |
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ENDIF |
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AlinMin=vg2Min*lenAz2 |
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viscA_s(i,j)=max(AlinMin,viscA_s(i,j)) |
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|
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ELSE |
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viscA_t(i,j)=viscAt |
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viscA_s(i,j)=viscAs |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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C - Laplacian and bi-harmonic terms |
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DO j=2-Oly,sNy+Oly-1 |
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DO i=2-Olx,sNx+Olx-1 |
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|
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uDissip(i,j) = |
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& recip_dyg(i,j,bi,bj)*recip_dyg(i,j,bi,bj) |
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& *recip_dxc(i,j,bi,bj) |
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& *( |
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& dyf( i , j ,bi,bj)*dyf( i , j ,bi,bj) |
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& *viscA_t( i , j )*tension( i , j ) |
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& -dyf(i-1, j ,bi,bj)*dyf(i-1, j ,bi,bj) |
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& *viscA_t(i-1, j )*tension(i-1, j ) |
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& ) |
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& +recip_dxc(i,j,bi,bj)*recip_dxc(i,j,bi,bj) |
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& *recip_dyg(i,j,bi,bj) |
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& *( |
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& dxv( i ,j+1,bi,bj)*dxv( i ,j+1,bi,bj) |
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& *viscA_s(i,j+1)*strain( i ,j+1) |
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& -dxv( i , j ,bi,bj)*dxv( i , j ,bi,bj) |
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& *viscA_s(i, j )*strain( i , j ) |
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& ) |
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|
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vDissip(i,j) = |
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& recip_dyc(i,j,bi,bj)*recip_dyc(i,j,bi,bj) |
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& *recip_dxg(i,j,bi,bj) |
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& *( |
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& dyu(i+1, j ,bi,bj)*dyu(i+1, j ,bi,bj) |
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& *viscA_s(i+1,j)*strain(i+1,j) |
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& -dyu( i , j ,bi,bj)*dyu( i , j ,bi,bj) |
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& *viscA_s( i ,j)*strain( i ,j) |
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& ) |
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& -recip_dxg(i,j,bi,bj)*recip_dxg(i,j,bi,bj) |
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& *recip_dyc(i,j,bi,bj) |
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& *( |
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& dxf( i , j ,bi,bj)*dxf( i , j ,bi,bj) |
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& *viscA_t(i, j )*tension(i, j ) |
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& -dxf( i ,j-1,bi,bj)*dxf( i ,j-1,bi,bj) |
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& *viscA_t(i,j-1)*tension(i,j-1) |
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& ) |
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|
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ENDDO |
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ENDDO |
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|
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RETURN |
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END |
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